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Table 5
Orbital parameters estimated for the τ Boo system.
| Parameter | Value |
|
|
|
| τ Boo b | |
|
|
|
| Period [days] | 3.3124568 ± 6.9 × 10-6 |
| Tperiastron [BJDUTC-2 450 000] | 6400.94 ± 0.30 |
| K [m s-1] | 471.73 ± 2.97 |
| e | 0.011 ± 0.006 |
| ω [deg] | 113.4 ± 32.2 |
| γ [m s-1] | 0.0 |
| msini [MJup] | 4.32 ± 0.04 |
| semi-major axis [AU] | 0.049 ± 0.003 |
|
|
|
| τ Boo B | |
|
|
|
| Period [yr] | 964 (fixed) |
| Tperiastron [BJDUTC-2 450 000] | 12670 (fixed) |
| K [m s-1] | 1217.06 ± 222.36 |
| e | 0.71 ± 0.22 |
| ω [deg] | 94.1 ± 64.0 |
| γ [m s-1] | −1099.5 ± 273.0 |
| msini [M⊙] | 0.4 ± 0.1 |
| semi-major axis [AU] | 109 ± 7 |
|
|
|
| offsetLick,setup13 [m s-1] | 0.0 |
| offsetLick,setup6 [m s-1] | −23.17 |
| offsetLick,setup8 [m s-1] | 19.03 |
| offsetHARPS−N [m s-1] | −16294.87 |
|
|
|
| independent long term trends | |
|
|
|
| RV slopeLick,setup2 [m s-1 y-1] | 2.7 ± 5.5 |
| RV slopeLick,setup13 [m s-1 y-1] | −13.8 ± 5.6 |
| RV slopeLick,setup6 [m s-1 y-1] | −8.8 ± 3.4 |
| RV slopeLick,setup8 [m s-1 y-1] | −18.6 ± 2.4 |
| RV slopeHARPS−N [m s-1 y-1] | −36.6 ± 4.0 |
Notes. Period and periastron of the binary companion τ Boo B were fixed to those of the astrometric solution reported by Drummond (2014).
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